I'd like to add to corsaman's comments:
Scenic Airlines fly from Boulder Muni airfield, between Las Vegas and the Hoover Dam. I had the pleasure of flying with them two weeks ago. The people there were really nice and on production of an ID got Mrs f and me on stand-by for the last flight of the day, for $80 each (instead of $139 regular). The flights -- TwOtters only -- last a little over an hour and the scenery is incredible beautiful, although they only fly over the western part of the Grand Canyon.
As they say on ebay: Highly recommended! A+++